Mad Scientist Sister

"Hah, hah, my newest invention seemed so promising," Dr. Lily Richards pants raggedly, wiping sweat from her brow. Her limbs trembled in the aftermath of the failed experiment, which took an unexpected turn she was not prepared for.

"Dammit!" She cursed under her ragged breath. Her mind raced with forbidden desires beyond any experience before as her newfound futa cock raged against the confines of her labcoat. Try as she might to think of a solution, her libido had taken control.

She needed release, and needed it now, before madness took her. With wild eyes she scanned the room for any object that could help quench the inferno raging in her loins. It was then, through the haze of lust, that she heard the doorknob jiggle.

Frozen in place, pants tented obscenely, Lily could only watch as the door creaked open, revealing her sibling CraveU user.